Propeller.



C. A. BRYAN.

PROPELLBR.

APPLICATION FILED DBO. 21, 1912.

1,090,271 1- Patented Mar. 17, 1914.

@umm M nmvuMmA PLANUGRAPH co1. WASHING-rim, D. e.

CHESTER A. BRYAN,

OF HALL CITY, FLORIDA.

PROEELLER.

Application led December 21, 1912.

To all 107mm t may concern Be itknown that I, Cnns'rnn A. Barts, a citizen of the United States, residing at I-Iall City, in the State of Florida, have invented a new and useful Propeller; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

rIhis invention relates to a new and useful propeller, which is applicable to various types of boats, acroplancs and windmills, and the like machinery.

As one of the objects of the invention, it is the aim to provide a propeller having replaceable propeller blades, so that the propeller may be repaired, in case the blades become injured or broken.

As further stated, another object of the invention, is that a supply of blades is to be provided for a propeller in practice, so that when one of the blades or both become injured, another blade may be substituted, and when such is the case the propeller remains uniform in balance and weight, owing to the fact that all the blades are made after one and the same pattern.

One of the features of the invention Is the provision of a hub member having dovetailed recesses, which are tapered longitudinally, in order to receive the bases of each blade, there being novel means to prevent displacementof the bases of the blade in one direction, while the tapering contour ot' the recesses prevent displacement of the blade in an opposite direction.

In the drawings there is disclosed certain features of construction, but in practical fields these features may necessitate alterations, to which the patentes has a right, provided the alterations are within the scope of what is claimed.

The invention comprises further features and combination of parts, as hereinafter set forth, shown in the drawings and claimed.

In the drawings :MFigure 1 is a view in side elevation of the improved propeller. Fig. 2 is a :fragmentary sectional view on line 2-2 of Fig. l. Fig. 3 is a fragmentary sectional view on line 3-3 of Fig. 2. Fig. 4t is a fragmentary sectional View on line 1 4 of Fig. 1. Fi 0. 5 is a det-ail view. Fig. 6 is a View showing a. different construction. Fig. 7 is a sectional view on line 7-7 of Fig. 6.

Specification of Letters Patent.

Patented Mar. V', 1914.

serial No. 738,085.

Referring more especially to the drawings, 1 designates a portion of a propeller shaft having a redi'lced portion Q, on which adjacent the shoulder 3, the hub L1 of the propeller is secured by means of a nut The hub l is provided with oppositcly arranged dove-tailed recesses 5", which are tapered longitudinally as shown. Ani'anged in the recesses are the bases 7 of the propeller blades 8, said bases being correspondingly shaped with regard to the recesses, so as to fit closely therein. Arranged in the recesses are spring` members 9 having lateral portions 1.0 adapted to engage the under surfaces 11 of the bases of the blade, so as to prevent displacement of the bases in one direction, while the tapering contour of the recesses prevents longitudinal displacement of the bases in an opposite direction. To disengage the lateral portions of the spring members from engagement with the surfaces of the bases of the blades` thumb screws 1Q, which extend transversely of the hub, are provided, which thumb screws are constructed with projections, adapted to cam against the springl members. so as to throw the lateral portions thereof from engagement with the bases, whereby the blades may be removed, so that new blades may be inserted.

In Figs. (S and 7 the spring members are dispensed with, and the. thumb screws 14 engage notches 15 of the bases of the blades. so as to hold the bases in place. In Figs. G and 7 when tightening the thumb screws, the Shanks thereof engage inclined portions 16 of said notches, so as to prevent displacement of the blades in one direction, while the tapering contour of the recesses prevent displacement of the blades in the opposite direction.

The invention having been set forth, what is claimed as new and useful is l. In combination, a propeller hub having oppositely arranged dove-tailed recesses which are tapered longitudinally, propeller blades having bases shaped correspondingly with regard to the recesses and fitted therein, the bases having notches provided with inclined portions, devices arranged in and carried by the wall of said recesses of said hub and having means impinging coperatively with portions of said notches to prevent longitudinal displacement of the bases in one direction, while the longitudinal taper of the recesses prevent displacement of the bases in an opposite direction, said devices With their attendant means together` ing oppositely arranged dove-tailed recessesl which are tapered longitudinally, propeller blades having bases shaped correspondingly with regard to the recesses and fitted therein, the bases having teeth, spring members secured in the recesses having lateral portions to engage vthe teeth to prevent longitudinal displacement of the bases in one direction, While the longitudinal taper of the recess prevents displacement of the bases in 15 an opposite direction7 and means for dis- 4engaging the lateral port-ions of the spring members from the teeth.

In testimony whereof I have signed my name to this specification in the presence of 20 two subscribing witnesses.

CHESTER A. BRYAN.

Witnesses ROBERT A. MOYEP., B. F. BENNETT.

Copies of thisppatent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

